CN111999653B - Method and system for testing internal condensation condition of battery - Google Patents
Method and system for testing internal condensation condition of battery Download PDFInfo
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- CN111999653B CN111999653B CN202010739010.2A CN202010739010A CN111999653B CN 111999653 B CN111999653 B CN 111999653B CN 202010739010 A CN202010739010 A CN 202010739010A CN 111999653 B CN111999653 B CN 111999653B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to a method and a system for testing the internal condensation condition of a battery, wherein the method for testing the internal condensation condition of the battery comprises the following steps: acquiring the condensation parameter information inside a real battery; establishing an equivalent substitution model of the real battery according to the condensation parameter information; detecting the equivalent substitution model in an equivalent test environment working condition to obtain the equivalent water condensation quantity of the equivalent substitution model; obtaining the real water condensation amount in the real battery according to the equivalent water condensation amount; therefore, the equivalent substitution model is established, the real water condensation amount in the real battery can be obtained, meanwhile, the equivalent substitution model can be disassembled, assembled and replaced at any time, the test cost is lower than that of the real battery, and the safety of experimental equipment personnel can be prevented from being damaged due to high-voltage leakage of the real battery through the equivalent substitution model.
Description
Technical Field
The invention relates to the technical field of battery condensation testing, in particular to a method and a system for testing the internal condensation condition of a battery.
Background
The battery is the most core part of the power automobile, and currently, in order to prevent the exhaust of the internal thermal runaway battery core and the balance of internal and external air pressure, the power battery system is commonly provided with an explosion-proof valve containing a waterproof breathable film, and the waterproof breathable film allows the permeation of water vapor; the power battery system also commonly uses a water cooling system connected with the whole vehicle, when the electric vehicle runs or charges in a high-temperature and high-humidity environment, the water cooling system can be filled with low-temperature cooling liquid, water vapor in the battery system can form condensed water on a water cooling plate, and external water vapor permeates into the battery system to cause continuous condensation; when the electric automobile is continuously used in a high-temperature and high-humidity environment, water mist can be generated in modules, copper bars, distribution boxes and the like in the battery system due to accumulation of internal condensate water and increase of humidity, so that electric gaps and creepage distances are greatly reduced, and high-voltage safety is endangered.
In the related technology, the battery pack can be directly used for re-weighing under the working conditions of charging and discharging in an external damp and hot environment, and the weight change is the water condensation quantity; however, because the power battery system generally weighs hundreds of kilograms, the relative measurement error is larger, and risks such as high-voltage leakage are easy to generate, and the safety of test equipment and personnel is threatened.
Disclosure of Invention
The embodiment of the invention provides a method and a system for testing the internal condensation condition of a battery, which can obtain the real condensation quantity of the inside of a real battery by establishing an equivalent substitution model and have stronger operability.
In one aspect, an embodiment of the present invention provides a method for testing a condensation condition inside a battery, including the following steps: acquiring the condensation parameter information inside a real battery; establishing an equivalent substitution model of the real battery according to the condensation parameter information; detecting the equivalent substitution model in an equivalent test environment working condition to obtain the equivalent water condensation quantity of the equivalent substitution model; and obtaining the real water condensation quantity in the real battery according to the equivalent water condensation quantity.
In some embodiments, the step of acquiring the condensation parameter information of the real battery specifically includes the following steps: acquiring the condensation parameter information inside a real battery; wherein the condensation parameter information is the external space volume L of the battery box body except for the internal parts 1 Total heating power P of battery module 1 Area S1 of water cooling system 1 Area S2 of waterproof and breathable film of explosion-proof valve 2 。
In some embodiments, the step of establishing an equivalent substitution model of the real battery specifically includes the following steps: establishing an equivalent substitution model of a real battery; the equivalent substitution model comprises a box substitution model corresponding to a battery box of the real battery, a water cooling substitution model corresponding to a water cooling system, a breathable film substitution model corresponding to a waterproof breathable film of an explosion-proof valve and a module substitution model corresponding to a battery module.
In some embodiments, the scaling factor of the equivalent surrogate model to the real battery is α, where α >0.
In some embodiments, the step of establishing an equivalent substitution model of the real battery specifically includes the following steps: establishing an equivalent substitution model of a real battery; wherein the tank replacement model in the equivalent replacement model removes an outer space volume l=l of an inner part 1 * Alpha; in the equivalent substitution modelTotal heating power p=p of the module replacement model of (c) 1 * Alpha; area s1=s1 of water-cooled substitution pattern in the equivalent substitution pattern 1 * Alpha; area s2=s2 of the air permeable membrane substitution pattern in the equivalent substitution pattern 2 *α。
In some embodiments, the step of detecting the equivalent substitution model in the equivalent test environment working condition to obtain the equivalent water condensation amount of the equivalent substitution model specifically includes the following steps: setting a water receiving container at the joint of the box body replacing model and the water cooling replacing model; conveying cooling liquid into the water-cooling substitution model, and controlling a heating device to heat the module substitution model; detecting the equivalent condensation quantity X arranged in the water receiving container 1 。
In some embodiments, the step of obtaining the real water condensation amount inside the real battery according to the equivalent water condensation amount specifically includes the following steps: according to the obtained equivalent condensation quantity X 1 Obtaining the real condensation amount X=X in the real battery 1 /α。
In some embodiments, after the step of obtaining the real amount of the condensed water inside the real battery according to the equivalent amount of the condensed water, the method further includes the following steps: performing risk evaluation according to the real condensation amount in the real battery; if the risk evaluation does not pass, changing and extracting the condensation parameter information in the real battery, and re-testing; and if the risk evaluation is passed, completing the test.
In some embodiments, when an equivalent substitution model of the real battery is established, the equivalent substitution model needs to keep airtight after removing the explosion-proof valve, the water cooling substitution model in the equivalent substitution model is the same as the water cooling system material of the real battery, and the ventilation film substitution model in the equivalent substitution model is the same as the waterproof ventilation film thickness of the real battery.
In one aspect, an embodiment of the present invention provides a system for testing a condensation condition inside a battery, including: equivalent substitution model, heating device and water receiving container; the equivalent replacement model comprises a box body replacement model corresponding to a battery box body of a real battery, a water cooling replacement model corresponding to a water cooling system, a breathable film replacement model corresponding to a waterproof breathable film of an explosion-proof valve, and a module replacement model corresponding to a battery module; the heating device is arranged in the equivalent substitution model and is used for heating the module substitution model; the water receiving container is arranged at the joint of the box body substitution model and the water cooling substitution model and is used for detecting the equivalent water condensation quantity of the equivalent substitution model.
The technical scheme provided by the invention has the beneficial effects that: by establishing the equivalent substitution model of the real battery, the equivalent substitution model can be amplified or reduced according to actual conditions, and the equivalent substitution model is placed in an equivalent test environment working condition to be detected, so that the real water condensation quantity in the real battery is obtained according to the equivalent water condensation quantity of the equivalent substitution model, therefore, the test method for the water condensation condition in the battery is more operable and can replace the actual test environment working condition of the real battery, meanwhile, the equivalent substitution model is high in replaceability, disassembly and replacement can be performed at any time, the test cost is lower than that of the real battery, and the safety of experimental equipment personnel can be prevented from being damaged due to high-voltage leakage of the real battery through the equivalent substitution model.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a method for testing the internal condensation condition of a battery according to an embodiment of the invention;
fig. 2 is a schematic diagram of a test system for the internal condensation condition of a battery according to an embodiment of the invention.
In the figure: 1. equivalent substitution model; 10. replacing the model with the box body; 11. water cooling is used for replacing the model; 12. a breathable film substitution model; 13. replacing the model by the module; 2. a heating device; 3. a water receiving container.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
See fig. 1; the embodiment of the invention provides a method for testing the internal condensation condition of a battery, which comprises the following steps: acquiring the condensation parameter information inside a real battery; establishing an equivalent substitution model 1 of a real battery according to the condensation parameter information; detecting the equivalent substitution model 1 in an equivalent test environment working condition to obtain the equivalent water condensation amount of the equivalent substitution model 1; and obtaining the real water condensation quantity in the real battery according to the equivalent water condensation quantity.
By establishing the equivalent substitution model 1 of the real battery, the equivalent substitution model 1 can be enlarged or reduced according to actual conditions, meanwhile, the equivalent substitution model 1 is placed in an equivalent test environment working condition for detection, and then the real water condensation quantity inside the real battery is obtained according to the equivalent water condensation quantity of the equivalent substitution model 1, so that the test method of the water condensation condition inside the battery has higher operability, can replace the actual test environment working condition of the real battery, can be detached and replaced at any time due to strong replaceability of the equivalent substitution model 1, has lower test cost compared with the test cost of the real battery, and can ensure that the safety of experimental equipment personnel is avoided due to high-voltage leakage of the real battery through the equivalent substitution model 1.
Optionally, the step of acquiring the condensation parameter information of the inside of the real battery specifically comprises the following steps: acquiring the condensation parameter information inside a real battery; wherein the condensation parameter information is the external space volume L of the battery box body except for the internal parts 1 Battery module assemblyHeating power P 1 Area S1 of water cooling system 1 Area S2 of waterproof and breathable film of explosion-proof valve 2 。
The condensation parameter information is the external space volume L of the battery box body except the internal parts, wherein the parts in the external space volume are mainly parts such as a distribution box, a module, a battery management system, a wire harness and the like of a real battery 1 The method comprises the steps of carrying out a first treatment on the surface of the At the same time, the total heating power P of the battery module 1 Area S1 of water cooling system 1 Area S2 of waterproof and breathable film of explosion-proof valve 2 The method can be obtained according to the actual condition of a real battery; it should be noted that the area of the water cooling system is mainly the area of the water cooling plate and the heat conducting pad.
Referring to fig. 2, in the embodiment of the present invention, in order to establish the equivalent substitution model 1 of the real battery, the condensation parameter information of the inside of the real battery is extracted, that is, the external space volume L of the internal parts needs to be removed according to the battery box 1 Total heating power P of battery module 1 Area S1 of water cooling system 1 Area S2 of waterproof and breathable film of explosion-proof valve 2 And performing one-to-one correspondence setting of all parts in the equivalent substitution model. The step of establishing the equivalent substitution model 1 of the real battery specifically comprises the following steps: establishing an equivalent substitution model 1 of a real battery; wherein the equivalent substitution pattern 1 comprises a case substitution pattern 10 corresponding to a battery case of the real battery, a water-cooling substitution pattern 11 corresponding to a water-cooling system, a ventilation film substitution pattern 12 corresponding to a waterproof ventilation film of an explosion-proof valve, and a module substitution pattern 13 corresponding to a battery module.
Optionally, the scaling factor of the equivalent substitution model 1 and the real battery is α, where α >0; because the equivalent substitution model 1 of the real battery is established, the real battery can be replaced to detect in the equivalent test environment working condition, and the equivalent substitution model can be scaled up or scaled down relative to the real battery according to actual conditions, the test method of the internal condensation condition of the battery has higher operability and strong replaceability, and can be disassembled and replaced at any time.
Optionally, in order to make an enlargement or reduction setting on the equivalent substitution model according to the proportionality coefficient α; the step of establishing the equivalent substitution model 1 of the real battery specifically comprises the following steps: establishing an equivalent substitution model 1 of a real battery; wherein the tank replacement model 10 of 1 in the equivalent replacement model removes the outer space volume l=l of the internal parts 1 * Alpha; total heating power p=p of the module substitution model 13 in the equivalent substitution model 1 1 * Alpha; area s1=s1 of water-cooling substitution pattern 11 in equivalent substitution pattern 1 1 * Alpha; area s2=s2 of the air permeable membrane substitution pattern 12 in the equivalent substitution pattern 1 2 *α。
Optionally, the step of detecting the equivalent substitution model 1 in the equivalent test environment working condition to obtain the equivalent water condensation amount of the equivalent substitution model 1 specifically includes the following steps: setting a water receiving container 3 at the joint of the box body substitution model 1 and the water cooling substitution model 11; delivering cooling liquid into the water-cooling substitution pattern 11, and controlling the heating device 2 to heat the module substitution pattern 13; detecting the equivalent amount of condensation X provided in the water receiving container 3 1 。
After the equivalent substitution model 1 of the real battery is established through the proportionality coefficient alpha, the equivalent establishment of the actual test environment working condition of the real battery is required, and the equivalent test environment working condition mainly comprises: a cooling liquid is conveyed into the water-cooling substitution pattern 11, and the heating device 2 is controlled to heat the module substitution pattern 13; it should be noted that, by using the heating device 2 to replace the live module of the real battery, the potential high-voltage hidden danger threat in the test is eliminated, and the safety of the personnel of the experimental equipment is avoided; meanwhile, by arranging the water receiving container 3 at the joint of the box body substitution model 1 and the water cooling substitution model 11, the equivalent condensation quantity X of the equivalent substitution model 1 can be directly detected through the water receiving container 3 1 The water receiving container 3 can be arranged as a measuring cup, so that the water receiving container is more visual and accurate.
Optionally, the method obtains true internal of the real battery according to the equivalent water condensation amountThe step of solid condensate quantity comprises the following steps: according to the obtained equivalent condensation quantity X 1 Obtaining the real condensation amount X=X in the real battery 1 Alpha; because the proportionality coefficient of the equivalent substitution model 1 and the real battery is alpha, the equivalent condensation quantity X can be directly obtained 1 Obtaining the real condensation amount X=X in the real battery 1 /α。
Optionally, after the step of obtaining the real condensation amount inside the real battery according to the equivalent condensation amount, the method further includes the following steps: performing risk evaluation according to the real condensation amount in the real battery; if the risk evaluation does not pass, changing and extracting the condensation parameter information in the real battery, and re-testing, wherein the testing flow is restarted according to the testing flow; if the risk evaluation is passed, completing the test, and according to the obtained equivalent condensate quantity X 1 Obtaining the real condensation amount X=X in the real battery 1 Alpha. The risk evaluation method may be to evaluate whether or not the actual amount of condensation X in the actual battery is abnormal by evaluating elements such as an electric gap of the battery and a high voltage condition in the battery.
Alternatively, in order to ensure that the equivalent substitution model of the battery is more consistent with the actual characteristics of the real battery, the equivalent condensate amount X of the equivalent substitution model 1 can be better passed 1 Feeding back the real condensation amount X in the real battery; when the equivalent substitution model 1 of the real battery is established, the equivalent substitution model 1 needs to keep air tightness after the explosion-proof valve is removed, the water cooling substitution model 11 in the equivalent substitution model 1 is the same as the water cooling system material of the real battery, and the ventilation film substitution model 12 in the equivalent substitution model 1 is the same as the waterproof ventilation film thickness of the real battery.
The embodiment of the application provides a test system of inside water condensation situation of battery, includes: equivalent substitution model 1, heating device 2 and water receiving container 3; the equivalent substitution pattern 1 includes a case substitution pattern 10 corresponding to the battery case of the real battery, a water-cooling substitution pattern 11 corresponding to the water-cooling system, a ventilation film substitution pattern 12 corresponding to the waterproof ventilation film of the explosion-proof valve, and a module substitution pattern 13 corresponding to the battery module; the heating device 2 is arranged in the equivalent substitution model 1, and the heating device 2 is used for heating the module substitution model 13; the water receiving container 3 is arranged at the joint of the box body substitution model 10 and the water cooling substitution model 11, and the water receiving container 3 is used for detecting the equivalent water condensation amount of the equivalent substitution model 1.
By establishing the equivalent substitution model 1 of the real battery, the equivalent substitution model 1 can be enlarged or reduced according to actual conditions, and meanwhile, the equivalent substitution model 1 is placed in an equivalent test environment working condition for detection, so that the real water condensation amount in the real battery is obtained according to the equivalent water condensation amount of the equivalent substitution model 1; when the equivalent substitution model 1 is tested in the equivalent test environment working condition, cooling liquid is conveyed into the water-cooling substitution model 11, and the heating device 2 is controlled to heat the module substitution model 13; meanwhile, by arranging the water receiving container 3 at the joint of the box body substitution model 10 and the water cooling substitution model 11, the equivalent water condensation amount of the equivalent substitution model 1 can be directly detected through the water receiving container 3, so that the method is more visual and accurate; therefore, the test system for the internal condensation condition of the battery has operability, can replace the actual test environment working condition of the real battery, can be disassembled and replaced at any time due to strong replaceability of the equivalent replacement model 1, has low test cost compared with the test cost of the real battery, and can ensure the safety of avoiding damaging experimental equipment personnel due to high-voltage leakage of the real battery through the equivalent replacement model 1.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the term "inner" or the like is based on the azimuth or positional relationship shown in the drawings, and is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that, in the present invention, the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The method for testing the internal condensation condition of the battery is characterized by comprising the following steps of:
acquiring the condensation parameter information inside a real battery;
establishing an equivalent substitution model of the real battery according to the condensation parameter information;
detecting the equivalent substitution model in an equivalent test environment working condition to obtain the equivalent water condensation quantity of the equivalent substitution model;
obtaining the real water condensation amount in the real battery according to the equivalent water condensation amount;
the step of acquiring the condensation parameter information in the real battery specifically comprises the following steps:
acquiring the condensation parameter information inside a real battery;
wherein, the liquid crystal display device comprises a liquid crystal display device,the condensation parameter information is the external space volume L of the battery box body except for the internal parts 1 Total heating power P of battery module 1 Area S1 of water cooling system 1 Area S2 of waterproof and breathable film of explosion-proof valve 2 The method comprises the steps of carrying out a first treatment on the surface of the The step of establishing an equivalent substitution model of the real battery specifically comprises the following steps:
establishing an equivalent substitution model of a real battery;
the equivalent substitution model comprises a box substitution model corresponding to a battery box of the real battery, a water cooling substitution model corresponding to a water cooling system, a breathable film substitution model corresponding to a waterproof breathable film of an explosion-proof valve and a module substitution model corresponding to a battery module.
2. The method for testing the internal water condensation condition of a battery according to claim 1, wherein the scaling factor of the equivalent substitution model and the real battery is α, where α >0.
3. The method for testing the internal condensation condition of a battery according to claim 2, wherein the step of establishing an equivalent substitution model of a real battery comprises the following steps:
establishing an equivalent substitution model of a real battery;
wherein the tank replacement model in the equivalent replacement model removes an outer space volume l=l of an inner part 1 *α；
Total heating power p=p of the module substitution models in the equivalent substitution model 1 *α；
Area s1=s1 of water-cooled substitution pattern in the equivalent substitution pattern 1 *α；
Area s2=s2 of the air permeable membrane substitution pattern in the equivalent substitution pattern 2 *α。
4. The method for testing the internal condensation condition of a battery according to claim 2, wherein the step of detecting the equivalent substitution model in the equivalent test environment condition to obtain the equivalent condensation amount of the equivalent substitution model comprises the following steps:
setting a water receiving container at the joint of the box body replacing model and the water cooling replacing model;
conveying cooling liquid into the water-cooling substitution model, and controlling a heating device to heat the module substitution model;
detecting the equivalent condensation quantity X arranged in the water receiving container 1 。
5. The method for testing the internal condensation condition of a battery according to claim 4, wherein the step of obtaining the true condensation amount of the interior of the true battery according to the equivalent condensation amount comprises the following steps:
according to the obtained equivalent condensation quantity X 1 Obtaining the real condensation amount X=X in the real battery 1 /α。
6. The method for testing the internal condensation condition of a battery according to claim 1, wherein after the step of obtaining a true condensation amount inside the true battery based on the equivalent condensation amount, further comprising the steps of:
performing risk evaluation according to the real condensation amount in the real battery;
if the risk evaluation does not pass, changing and extracting the condensation parameter information in the real battery, and re-testing;
and if the risk evaluation is passed, completing the test.
7. The method for testing the internal condensation condition of a battery according to claim 1, wherein when an equivalent substitution model of a real battery is established, the equivalent substitution model is required to maintain air tightness after removing an explosion-proof valve, a water cooling substitution model in the equivalent substitution model is the same as a water cooling system of the real battery in material, and a ventilation film substitution model in the equivalent substitution model is the same as a waterproof ventilation film thickness of the real battery.
8. A system applying the test method for the internal condensation condition of a battery according to claim 1, comprising:
the equivalent substitution model comprises a box substitution model corresponding to a battery box of a real battery, a water cooling substitution model corresponding to a water cooling system, a breathable film substitution model corresponding to a waterproof breathable film of an explosion-proof valve and a module substitution model corresponding to a battery module;
the heating device is arranged in the equivalent substitution model and is used for heating the module substitution model; the method comprises the steps of,
the water receiving container is arranged at the joint of the box body substitution model and the water cooling substitution model and is used for detecting the equivalent condensation amount of the equivalent substitution model.
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